My suggestion is that we try to work with these guys, and find the right people inside the vendors and convince them that helping coreboot can only be a corporate advantage for them. I _know_ there is quite a reasonable number of such people in any of the corporations we're facing, including both Intel and NVidia.
I have nothing against that approach. In fact, that is what I would try first in any given case.
However, since InVidious has gone for years without listening to us, maybe a protest by one of is what is required to make them pay attention to the other.